Au/Y-ZnO composite with excellent acetone sensing was successfully prepared by a facile wet chemical method. X-ray diffraction analysis, field-emission scanning microscopy, and transmission electron microscopy investigation revealed that the obtained Au/Y-ZnO was mainly composed of ZnO wurtzite phase and Au nanoparticles with a face-centered structure in diameter of 10 nm, and Y atom replaced Zn lattice sites to form yttria phase. Compared with the pure ZnO and Y-doped ZnO, the Au/Y-ZnO-based sensor shows significantly enhanced acetone gas sensing. Its response to 100 ppm acetone is 27.6, which is about 2.3 and 5.5 times that of the Y-ZnO and the pure ZnO, respectively. The Au/Y-ZnO-based sensor has a low detection limit (1 ppm), and fast response (3 s) and recovery (9 s). Au modification can obviously decrease the operating temperature (275°C). The enhanced gas-sensing of Au/Y-ZnO towards acetone can be ascribed to Y_Zn and V⁻_Zn defects, the Schottky barrier between Au nanoparticles and Y-doped ZnO, and the catalytic activity of the Au nanoparticles.

通过简便的湿化学方法成功地制备了具有优异丙酮感测性能的Au / Y-ZnO复合材料。X射线衍射分析，场发射扫描显微镜和透射电子显微镜研究表明，所获得的Au / Y-ZnO主要由ZnO纤锌矿相和直径为10 nm的面心结构的Au纳米颗粒组成。原子取代锌晶格位点形成氧化钇相。与纯ZnO和Y掺杂的ZnO相比，基于Au / Y-ZnO的传感器显示出显着增强的丙酮气敏性。它对100 ppm丙酮的响应为27.6，分别约为Y-ZnO和纯ZnO的2.3和5.5倍。基于Au / Y-ZnO的传感器具有较低的检测限（1 ppm），快速的响应（3 s）和恢复（9 s）。修饰金可以明显降低工作温度（275°C）。_Zn和V ^- _Zn 缺陷，Au纳米颗粒与Y掺杂ZnO之间的肖特基势垒以及Au纳米颗粒的催化活性。